Download the haproxy package and extract it
the cd haproxy-version
./configure
make
make install
cp the haproxy.cfg file from install-dir/examples/haproxy.cfg and edit it as below-
# this config needs haproxy-1.1.28 or haproxy-1.2.1
global
log 127.0.0.1 local0 //For logging
log 127.0.0.1 local1 notice
#log loghost local0 info
maxconn 4096
daemon
user haproxy
defaults
log global
mode http
option httplog
option dontlognull
retries 3
option redispatch
maxconn 2000
contimeout 5000
clitimeout 50000
srvtimeout 50000
stats enable //This enables the statstics of haproxy server and you can view it in browser by http://ipaddress/haproxy-status
stats uri /haproxy-status
stats auth user:passwd
listen appli1-rewrite 0.0.0.0:80
cookie SERVERID rewrite
mode http
balance source
server app1_2 192.168.1.8:80 cookie app1inst2 check inter 2000 rise 2 fall 5
server app1_1 192.168.1.7:80 cookie app1inst1 check inter 2000 rise 2 fall 5
option httpchk
Configuring logging
Edit /etc/sysconfig/syslog
SYSLOGD_OPTIONS=”-m 0 -r”
Edit /etc/syslog.conf. Add the following:
local0.* /var/log/haproxy.log
local1.* /var/log/haproxy-1.log
Restart Syslog
service syslog restart
Keep Alived Daemon
yum install keepalived
Keepalived Configuration File /etc/keepalived/keepalived.conf
vrrp_script chk_haproxy { # Requires keepalived-1.1.13
script "killall -0 haproxy" # cheaper than pidof
interval 0 # check every 2 seconds
weight 2 # add 2 points of prio if OK
}
vrrp_instance VI_1 {
interface eth0
state MASTER
virtual_router_id 51
priority 101 # 101 on master, 100 on backup
virtual_ipaddress {
192.168.1.9
}
track_script {
chk_haproxy
}
}
